Background: Although infection with carbapenem-resistant Enterobacteriaceae (CRE) has become an urgent public health threat worldwide, the socioeconomic burden of CRE bloodstream infection (BSI) remains to be clarified.Methods: This retrospective study included all patients infected with Escherichia coli or Klebsiella pneumoniae who were hospitalized for BSI from 2013 to 2015. Socioeconomic burden, including direct and indirect economic burden, was compared in patients infected with carbapenem-sensitive Enterobacteriaceae (CSE) and CRE following 1:1 propensity score matching (PSM) to control for confounding variables. Results: Data from 879 patients with Enterobacteriaceae BSI were evaluated, including 152 (17.3%) patients infected with CRE and 727 (82.7%) infected with CSE. PSM yielded 112 pairs of 224 patients. Median hospital length of stay did not differ significantly in the CRE and CSE groups (35 vs. 29 days, P=0.089), but in-hospital 28-day mortality rate was significantly higher in patients infected with CRE than with CSE (45.5% vs. 32.1%, P =0.040). Median direct economic burden was significantly greater in patients with CRE-BSI than with CSE-BSI during hospitalization ($24940.1 vs. 16864.0, P=0.017) but not during the period after infection ($10403.4 vs. 8498.0, P=0.178). Drug expenditure accounted for the largest proportion of costs in both groups. The median disability-adjusted life year (DALY) was higher in CRE-BSI than in CSE-BSI patients, but the difference was not statistically significant (7.9 vs.6.7 years, P=0.190). Median indirect economic burden did not differ significantly in these two groups ($3848.5 vs.1139.9, P=0.304), although indirect economic burden increased significantly from 2013 to 2015 in patients with CRE-BSI.Conclusion: Carbapenem resistance had a major impact on the clinical and socioeconomic burden of patients with Enterobacteriaceae BSI. The higher mortality rate in patients with CRE-BSI was associated with increased direct healthcare burden and indirect socioeconomic loss.
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